You've got a bad pinion bearing, probably the big one right in front of the pinion geat teeth. Don't run it long that way, or you'll shell out some gear teeth. Fortunately, it's not terribly difficult to change out the pinion bearings. I'd reccomend swapping the bearings on both sides of the ring gear carrier while you're in there.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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